The Romans took most of their theatrical style from the Greeks, but what was the one art form that was uniquely Roman?

The Romans used Greek designs in their own public buildings. In time, they learned to use concrete to make even larger structures, such as the Pantheon in Rome. The Romans also used concrete to build huge stadiums like the Colosseum, where gladiators fought. But there some very distinct differences. Greek Theaters were carved out of a hillside while Roman theaters were built up from solid ground using either cement or stone. Also the orchestra is larger because the structures were used for other events which required more space.

Explanation:

Department of Greek and Roman Art, The Metropolitan Museum of Art ... and public banquets, for example—took as their backdrop the city itself. ... According to the ancient historian Livy, the earliest theatrical activity at Rome took the form of ... is the one at Pompeii, constructed in 80–70 B.C. Like most early amphitheaters, ...

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